Pneumatic tool



Feb 1930. c:. E. SOUTHERLAND 1,746,617

Filed June 19, 1925 o o o o o0 m Ni EZYEIZEE' E. Emh and Patented Feb. 11, 1930 PATENT .OFFICE CHARLES E. SOUTHERLA'ND, OF CHICAGO, ILLINOIS PNEUMATIC TOOL,

Application filed June 19,

My invention relates in general to pneumatic tools and more specifically to means for efiectively lubricating the moving parts of such pneumatic tools. In the usual type of pneumatic tools now in use there is no means provided for oiling the valves and working parts of such tools except by removing one of the plugs, the air hose, or some other part anddropping oil in the channels from an oil can. Some greasing devices have been designed but have been either cumbersome or impractical and itis the object of my invention to provide such an oiling device as will not interfere with the normal use of the tool and will be easily operated to supply lubricant to the working parts of the tool as often as required and in a simple manner.

The device of my invention may be incorporated into any existing type of tool, or the Z0 handle may be manufactured separately to include the device and be attachable to any known type of tool.

I have elected to illustrate my invention in conjunction with a pneumatic hammer of well known type, although it will, of course, be understood that it may also be applied to any other form of pneumatic tool. Itshould also be understood that, although I have shown the oiling device of my invention as a part of the handle of a pneumatic hammer, it may be manufactured in various other forms, that is, it may be detachable from the handle or may be applied in any other desired manner without departing from the spirit of my invention. v

The barrel of the hammer has been shown only in part and thevalve mechanism is not shown in full detail, but only indicated, as

the barrel and valve mechanism forms no part of my present invention.

In the drawings Fig. 1 illustratesa section of a pneumatic hammer with the barrel broken awayand with the oiling device of my invention shown in the hammer handle. Fig. 2 is a top view of that part of the handle directl surrounding the plunger of the oiling device with certain parts cut away in order to more clearly disclose the operation of the parts.

50 I will now explain more in detail the con- 1925. Serial No. 38,210.

struction and operation of my invention by referring to Figs. 1 and 2 of the drawings.

Referring to Fig. 1, I have shown the handle 2 in cross section, showing a threaded hole 3 Where the usual air tube is attached, The

air passes from the air tube through a channel v 4 to which it is admitted by means of a valve 7, controlled or operated by means of a trigger or lever 8; the'valve 7 being returned by a spring 5 which is held in place by a plug 6. The channel 4 leads through the hammer handle to the inlet ports 9 where the air enters the barrel of the hammer to operate the valve mechanism indicated therein. A plug 10 is provided to giveaccess to the channel 4:. The handle 2 is formed from a casting and at 11 is provided an oil chamber or reservoir. This chamber is preferably formed by drilling a hole through the casting into the channel 4 and then reaming out a chamber 11 and threading the'inside and outside ends of the hole at 12 and 13. Into the hole is inserted a valve assembly, threaded at both ends to register with the threaded holes 12 and 13. This valve assembly consists of a cylinder 14. having a series of holes 15 to permit the passage of oil from the chamber 11 into the cylinder. Inside the cylinder is mounted a valve 16 carrying rigidly fixed thereto a washer 17 and passing through a washer 18 which rests against a shoulder on the inner wall of the cylinder. On one end of the stem of valve 16 is a button 19 threaded on the stem. A spring 20 is compressed between thewasher 18 and the button 19 thus always maintaining the valve seated in the position shown and preventing oil from passing from the cylinder into the air channel 4.

Referring to Fig. 2 it will be seen that the end of the cylinder 14 is slotted so that it may readily be screwed into the handle 2 and the button 19 is also slotted. The button 19 when depressed moves only a short distance into engagement with the end of cylinder 14, thereby moving the valve 16 out of its seat and carrying the washer 17 over the holes 15 to prevent oil from continuing toflow through said holes into the chamber formed between the head of valve 16 and washer 17. At 21 I provide a screw plug for filling the chamber 11 with oil.

In the operation of the device it will be seen that only a few drops of oil inserted into the channel 4 will be effective throughout the mechanism of the hammer as the oil will be carrie'd through the ports 9 and through the mechanism by the high air pressure passing through said channel 4. The oil from the chamber 11 will pass through the holes 15 into the chamber formed between the washer 17 and the head of the Valve 16, and when the button 19 is depressed the holes 15 will be closed and the oil from the cylinder .14 will pass into the channel 4 and be carried on by the air pressure to the working parts of the hammer.

It will be seen that the'pressing of the button 19 will permit only a certain amount of oil to pass from the reserve channel 11 into the hammer and that this will be amply sufiicient to lubricate the entire hammer. The amount of oil passed into the air channel by a single pressure ofthe plunger may of course be varied to suit requirements as some types of tools may require more oil than others.

It will be seen that I have provided a very simple and eflicient type of lubricating device which does not change the appearance or impair the effectiveness of the pneumati tool to which it is applied.

Having fully described and ascertained the features and aspects of my invention, what I consider to be new and desire to have protected by Letters Patent will be pointed out in the appended claim.

What I claim is:

In a device of the character described, a

handle having a fluid passage therethrough,

a manually operated valve for controlling said passage carried by said handle, a lubricator mounted in said handle and having a discharge outlet connected with said passageway, sald lubricator comprising a reservoir formed integral with the handle, a bore coaxial with the discharge outlet and extending through the wall of the reservoir to the exterior of the handle, a tube fitted into said bore and said discharge outlet, a valve carried by said tube and arranged for operating to discharge small quantities of oil into the fluid passage, and operating means for said valve accessible from the exterior of the handle.

In witness whereof, I hereunto subscribe my name this 13th day of June, A. D. 1925. CHARLES E. SOUTHERLAND. 

